[PATCH] Replace Mutex with RWMutex in PassRegistry

[Alex Crichton]

I emailed last week
(http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130624/179287.html)
about replace a mutex with an rwmutex to greatly reduce contention in
the test cases I found, but I forgot to mention that I don't have
committer's rights and would need someone to commit this for me.

The change was approved by Chris Lattner in the other thread, but if
someone could commit this for me, that would be great!

Thanks,
Alex
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